This depends on the severity of the nipping and how many corals are involved.
Say you own one brain coral. And thats the only coral your angel fish has decided to nip. Which do you want more the angel or the brain coral? Really comes to the personal preference of the reefer.
that said, if one buys a raccoon butterfly, and 99% of people’s experience on the forum are, “it eats corals”. Placing it in a reef and hoping you get the 1% might be a little above wishful thinking.
But to if it effects it long term will down to size of the coral and how often it nips. A one inch frag can only handle a few exploratory nips, as opposed to a 9” colony: